Objective lens

Details Objective lens Objective lens

1996-09-12

1998-06-16

Font, Frank G.

Optical: systems and elements

Lens

Including a nonspherical surface

359565, G02B 308, G02B 302

Patent

active

057680310

ABSTRACT:
An objective lens having a first surface and a second surface, includes a first face formed on the first surface, a second face formed on the second surface, and a third face formed on one of the first and second surfaces. The first, second, and third faces are adapted in such a way that the objective lens has at least two focal lengths.

REFERENCES:
patent: 4979807 (1990-12-01), Matsuoka
patent: 5349471 (1994-09-01), Morris et al.
patent: 5644413 (1997-07-01), Komma et al.
"Dual focus optical head for 0.6mm and 1.2mm disks", Komma, Y. et al., SPIE, vol. 2338, Optical Data Storage, pp. 282-288, 1994.

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